Cryptic Catch-up Crossword Starter - The Play

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Across
  1. 1. Sounds certain where the sea meets the land (5)
  2. 3. Weep for a tree (4)
  3. 5. Additional writer of 'Utopia'? (4)
  4. 6. Italian city where planes crash? (5)
  5. 7. Stout opiates contain perfect state (6)
  6. 11. Philosopher confused on teaming (9)
  7. 12. What Caliban collects is found between two odds. (4)
  8. 13. "Lady, stop, I ate", with nightmarish future within ((8)
Down
  1. 1. Playwright rattles weapon, we hear (11)
  2. 2. Animal without tail scrambles for Italian city (5)
  3. 4. Lure containing Evening Standard initially for stormy play (7)
  4. 8. Says its own state, surrounded by water (6)
  5. 9. More unwell tool gives mother character, we hear (7)
  6. 10. A power-grab that sounds like a pigeon's sound (4)